Chandra Observations of Diffuse X-Rays from the Sagittarius B2 Cloud
Chandra Observations of Diffuse X-Rays from the Sagittarius B2 Cloud
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DOI：
10.1086/322282
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发表时间：
2001-05
期刊：
影响因子：
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通讯作者：
H. Murakami;K. Koyama;Y. Maeda
中科院分区：
文献类型：
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作者：
H. Murakami;K. Koyama;Y. Maeda
我们提出的第一个钱德拉结果的巨大分子云人马座B2（Sgr B2），位于约100 pc远离银河系中心。漫射X射线与1.5个可分辨的点源清晰地分开。X射线谱在6.40 keV（Kα）和7.06 keV（Kβ）处显示出明显的铁K壳层跃迁线，在7.11 keV处显示出深的铁K边，在低能处显示出大的光电吸收。经吸收校正的X射线光度约为1 × 1035 ergs-1，比所有分辨点源的积分光度大2个数量级。漫射X射线主要来自云的西南半部分，呈凹形，指向银河系中心方向。这些结果有力地支持了ASCA模型，即Sgr B2是在银河系中心一侧被X射线源照射的。
We present the first Chandra results of the giant molecular cloud Sagittarius B2 (Sgr B2), located about 100 pc away from the Galactic center. Diffuse X-rays are clearly separated from one-and-a-half-dozen resolved point sources. The X-ray spectrum exhibits pronounced iron K-shell transition lines at 6.40 keV (Kα) and 7.06 keV (Kβ), deep iron K-edge at 7.11 keV, and large photoelectric absorption at low energy. The absorption-corrected X-ray luminosity is ~1 × 1035 ergs s-1, 2 orders of magnitude larger than the integrated luminosity of all the resolved point sources. The diffuse X-rays come mainly from the southwest half of the cloud with a concave shape pointing to the Galactic center direction. These results strongly support the ASCA model that Sgr B2 is irradiated by an X-ray source at the Galactic center side.